Fischer GeoSolid® 240HS

The grouting material Fischer GeoSolid 240HS was not only developed for the grouting of borehole heat exchangers, it can also be used in areas with sulphate bearing ground water. The thermal conductivity of more than 2,40 W/mK ensures a thermally optimum connection of the probe to the soil/rock and enables a sustainable efficiency of the whole geothermal installation. Furthermore, the great physical properties and the high mechanical resistance guarantee a long durability and a high resistance to environmental influences. 

Fischer GeoSolid 240HS complies with the recommendations on the frost-thaw-stability in accordance to DIN CEN/TS 12390-9 and its frost-thaw-stability is tested and proven. Therefore the material can be used even in areas with difficult geological conditions and strict official requirements.

The grout can be mixed in every commercially available mixer with the addition of clean water to a pumpable suspension. Fischer Spezialbaustoffe GmbH recommends for the mixing of grout for geothermal probes the mixer and injection plant MAT IEC 40.

Fischer Geo Solid 240HS complies with the current recommendations of VDI Guidelines (VDI 4640, part 2).

  • For sulphate bearing ground waters
    Especially designed for geothermal drilling in sulphate bearing ground waters

  • Frost-thaw-stability 
    According to DIN CEN/ TS 12390-9, The frost-thaw-stability is officially proven

  • Very high thermal conductivity
    Thermal conductivity > 2,40 W/mK

  • Accordance to VDI 4640
    Thermal use of the underground, part 2

  • Rarely reinjection necessary
    Efficient and economic grouting

  • Very good processability
    High product quality to ease working on site

  • Very high mechanical resistance

  • Low water permeability


Application areaFischer GeoSolid® 240HS was especially designed for the grouting of borehole heat exchangers in sulphate-bearing groundwater and incorporates all favourable characteristics in one product. It can be used for all kind of grouting and soil solidifaction.
Appropriate use areaMay be used in any surface.
Formulation/Processing6,25 l water: 25 kg Fischer GeoSolid® 240HS with compulsory mixers and accordingly
10,0 l water: 25 kg Fischer GeoSolid® 240HS with colloidal mixers.
Please keep the formulation and continue uninterrupted with processing after mixing the premixed dry mortar with water.
Processing timeAfter mixing process quickly.
Processing temperatureProcessible from +5 °C to max. +25 °C
Consumption1520 kg Fischer GeoSolid® 240HS  per meter cubed (m³)
Yield720 l/t
Marsh tunnel time69 sec.
Flow diameter215 mm (in accordance with DIN EN 12350-5)
Suspension density~ 1,9 kg/dm³
Thermal conductivity≥ 2,40 W/mK (cured sample of Fischer GeoSolid® 240HS)
Compressive strength> 10,0 N/mm²
Permeability kf< 10-9 m/s (Coeffcient of permeability, in accordance with guideline DIN 18130)
Tools/EquipmentFischer GeoSolid® 240HS can be mixed to a free-flowing suspension by adding water. The mixing time depends on the mixing system. Fischer GeoSolid® 240HS is best processed and homogenized in a colloidal mixer.
StorageIf stored correctly (dry, on pallets) and in original packaging, the material can be kept for at least 4 months
Delivery25 kg bags /42 bags on Europallet + Big Bags
Safety instructionsThe product contains cement and reacts with humidity/water, therefore protection of skin and eyes is needed. After skin contact wash immediately with plenty of water. In the event of contact with the eyes immediately rinse thouroughly with water and consult a doctor. This product is exempt from the specific labelling requirements of Ordinance of Hazardous Substances. Please observe also EC safety data sheet for the product Fischer GeoSolid® 240HS.
DisclaimerThe above data relate to tests under laboratory conditions with the usual metrological tolerances. The testing was done to obtain information about the basic suitability of our product in respect of the intended purpose. The given information is without obligation and therefore does not release customers from the obligation to carry out their own specific tests. We assume no responsability for the absence of features and/or properties. There is no claim for damages.

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